法拉第效率
阳极
碳化
烧焦
锂(药物)
碳纤维
材料科学
化学工程
电化学
产量(工程)
热解
化学
电极
复合材料
复合数
内分泌学
物理化学
工程类
医学
扫描电子显微镜
作者
Yu Han,Dabin Chung,Koji Nakabayashi,Jong‐Bae Chung,Jin Miyawaki,Seong Ho Yoon
标识
DOI:10.1016/j.electacta.2016.07.138
摘要
Anodic hard carbon for lithium-ion batteries with high discharge capacity was successfully developed using mangrove green tree as a cheap raw material. To obtain commercial-level first-cycle Coulombic efficiency, the effects of heat pre-treatment in the low temperature range of 450–600 °C at various pressures, to produce optimized char precursor before carbonization, were closely investigated, focusing on synthetic yield, structural and physical properties, first-cycle Coulombic efficiency, and discharge capacity of the resulting hard carbon. The hard carbon with heat pre-treatment involving optimum fabrication conditions of 500 °C in inner gas at 0.7 MPa for 39 days exhibited higher synthetic yield of 30.0 wt% and better first-cycle Coulombic efficiency of 81% and discharge capacity of 424 mAh/g than that prepared through direct one-step carbonization, due to low H/C and Odiff/C ratios and a pore structure promoting lithium-ion insertion/desertion.
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